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L2VPN Provisioning & Signaling

Learn about modular provisioning, discovery techniques, and signaling for L2VPNs. Explore various L2VPN schemes and autodiscovery methods in this comprehensive guide.

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L2VPN Provisioning & Signaling

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  1. L2VPN Provisioning & Signaling draft-ietf-l2vpn-signaling-03.txt Eric Rosen Wei Luo Bruce Davie Cisco Systems Vasile Radoaca Westridge Networks

  2. The story so far • Prior versions of this draft describe modular approach to provisioning, discovery and signaling for L2VPNs • VPWS, VPLS (hierarchical, distributed, and vanilla) • LDP- & L2TPv3-based signaling • BGP-based autodiscovery • Other autodiscovery methods possible

  3. Changes from -02 version • Main change: added new section on Inter-AS issues • Builds on "PW Switching" draft* • This forced some small changes to PW signaling procedures for VPLS (3.2.3 and 3.5.1) • Also added some clarifying text in BGP-based autodiscovery sections (3.2.2.1 and 3.3.2.1) * draft-martini-pwe3-pw-switching-01.txt

  4. Multi-AS tunnel LSP model AC 3 AC 1 PE-3 PE-1 • PE-PE LSP is built as per RFC 2547, option (c) • Addresses of PEs + labels carried in BGP • PW signaling from PE-PE AS 1 AS 2 ASBR-2 ASBR-1 PE-2 PE-4 AC 4 AC 6 Tunnel LSP Attachment circuit Attachment circuit pseudo-wire LDP Auto-discovery (MP-iBGP) Auto-discovery (MP-iBGP) Auto-discovery (MP-eBGP)

  5. Pseudo-wire "switching" model AC 3 AC 1 ASBR-2 ASBR-1 PE-3 pwid 34 PE-1 pwid 78 pwid 111 • Autodiscovery analogous to L3VPN Model (b) - eBGP used between ASBRs • Limiting PW signaling to ASBRs gives control over policy and avoids mesh of PE-PE signaling AS 1 AS 2 PE-2 PE-4 AC 4 AC 6 Pseudowire Attachment circuit Pseudowire Attachment circuit Pseudowire LDP / L2TPv3 LDP / L2TPv3 LDP / L2TPv3 Auto-discovery (MP-iBGP) Auto-discovery (MP-iBGP) Auto-discovery (MP-eBGP) draft-martini-pwe3-pw-switching-01.txt

  6. BGP Autodiscovery • VPLS: BGP advertisement for a particular VSI at a given PE will contain: • an NLRI of AFI = L2VPN1, SAFI = TBD2, encoded as RD:PE_addr • a BGP next hop equal to the loopback address of the PE • extended community attribute containing one or more RTs • VPWS: BGP advertisement for a pool of attachment circuits at a given PE will contain: • an NLRI of AFI = L2VPN1, SAFI = TBD2, encoded as RD:pool_num • a BGP next hop equal to the loopback address of the PE • extended community attribute containing one or more RTs 1. Same for all L2VPN schemes (e.g. vpls-bgp)2. Same value for both cases in this draft

  7. Changes to VPLS signaling • -02 assumed that signaling was PE-PE, therefore need only identify the VPLS instance within the PE • AGI = VPN-ID, TAII = SAII = null • When signaling between ASBRs, need to identify the PE as well • AGI = VPN-ID, TAII = PE_addr, SAII = null • Note: PE_addr is just an identifier, need not be routable • For Dist. VPLS, SAII = n - this allows multiple PWs from N-PE to N-PE

  8. Next steps • draft-ietf-l2vpn-vpls-ldp-xx.txt should change to reflect this change (or just reference this draft) • Synchronize with draft-ietf-l3vpn-bgpvn-auto-xx.txt • WG last call for this draft?

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